Enhance the Entity annotation to add index property that can be set to true or false

[sai-pullabhotla]

Enhance the Entity annotation to add index property that can be set to true or false. This should default to true. All fields should inherit the index property of the Entity, if it is not overridden in the Property annotation.

[lostpebble]

I would very much like this, so that I can set defaults for the entire entity as far as indexing goes.

I usually pick and choose which properties to index, sometimes having only a few on an entity with many properties. This causes the entity to look a bit messy because I have to annotate many properties with @Property(indexed=false).